Hello and welcome to Mayo Connect. I'm not Lynn, but I bet you are anxious to get started learning about your condition.
First of all, this disease and all the scary posts one finds are a real downer.
Rather than retyping what I posted earlier today, I hope you don't mind if I give you this link:
https://connect.mayoclinic.org/discussion/does-mac-cause-abdominal-pain-med-or-not/
There are a number of great resources there, but I hope that first you will tell us a little about yourself, your treatment so far, and what you most want to know.